Sliding element guide system

ABSTRACT

A sliding element guide system for furniture is provided, including a cabinet unit rail, central rail, sliding element rail, and at least one carriage. The cabinet unit rail, central rail, and sliding element rail are mounted to be movable in relation to one another. The system also includes two identical synchronization wheels that synchronize movements of elements of the system. The two identical synchronization wheels are rotatably mounted on a vertically oriented central rail side wall and extend horizontally therefrom via a pin.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of U.S. application Ser. No.16/209,229, filed Dec. 4, 2018 and claims the benefit under 35 USC §119(a)-(d) of German Application No. 10 2017 128 751.5 filed Dec. 4,2017, the entireties of which are incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to a sliding element guide system.

BACKGROUND OF THE INVENTION

Guide rails, or guide systems, respectively, for a sliding element, inparticular, a sliding element of an item of furniture or of a domesticappliance such as, for example, a kitchen apparatus, are known invarious embodiments.

For example, so-called part-pullouts as guide systems having two guiderails, or full pullouts having three guide rails, are used in the caseof a pullout functional unit, wherein the rails are movable relative toone another in a telescopic manner.

A sliding element such as, for example, a drawer, a shelf base, a foodtray, or the like, is typically received in a displaceable manner by wayof exactly two separate functional units of the same type of apart-pullout or of a full pullout. The respective functional unit of thepullout guide is preferably fastened to an internal side of a furniturecabinet unit or of a housing of a domestic appliance or kitchenapparatus, respectively.

A guide system, or a guide rail, respectively, must meet high technicaland economic requirements, and further optimizations in this respect areto be pursued.

SUMMARY OF THE INVENTION

It is an object of the present invention to further improve guidesystems of the type mentioned at the outset, the provision thereof, andcorresponding items of furniture or domestic appliances or kitchenapparatuses, respectively. In particular, the guide systems are to beoptimized with a view to a comparatively high mechanical load-bearingcapacity and/or improved economical production.

The present invention proceeds from a sliding element guide system, inparticular, a linear guide system, for an item of furniture or for adomestic appliance, for example, for a kitchen apparatus, wherein thesliding element guide system has a cabinet unit rail, a central rail,and a sliding element rail, wherein the sliding element guide system hasa carriage such that the cabinet unit rail, the central rail, and thesliding element rail are mounted so as to be movable in relation to oneanother, wherein the sliding element guide system comprisessynchronization means so as to synchronize movements of elements of thesliding element guide system, wherein the synchronization means have asynchronization element.

The sliding element guide system is configured, for example, in the formof a full pullout. The full pullout in the assembled state comprises twocarriages, for example. It is conceivable for the full pullout to havetwo identical carriages. However, it is also imaginable that the fullpullout comprises two dissimilar carriages, the two carriages differingfrom one another, in particular, exclusively in terms of the lengthsthereof, for example.

The sliding element guide system is, advantageously, a linear guidesystem. For example, the sliding element guide system is provided fordisposal on an item of furniture or a domestic appliance, for example,as a furniture guide system or as a domestic appliance guide system.This is furthermore based on an alignment of the guide rails of thesliding element guide system in the use state, or installed state,respectively, of the sliding element guide system on an item offurniture or on a domestic appliance such as, for example, a kitchenapparatus.

The core concept of the present invention lies in that two identicalsynchronization elements are present on the central rail, wherein thesynchronization elements are rotatably disposed on the central rail,wherein the synchronization elements are disposed so as to be mutuallyopposite and mutually spaced apart on both sides of the central rail,wherein the synchronization elements are configured on mutually oppositeend sides of the central rail or on mutually opposite external sides ofthe central rail. On account thereof, movements of elements of thesliding element guide system are advantageously capable of beingsynchronized. Elements of the sliding element guide system are, inparticular, understood to be the rail elements such as the cabinet unitrail, the central rail, and the sliding element rail, as well as thecarriage.

Exactly two synchronization elements are advantageously disposed on thecentral rail. For example, the synchronization elements are configuredfor synchronizing a movement of exactly two or exactly three elements ofthe guide system. The synchronization elements are identical, forexample.

The sliding element guide system having synchronization elementsdisposed thereon is preferably configured in such a manner that at leasttwo synchronization elements cannot simultaneously roll across an, inparticular, imaginary, for example, continuous, plane, a continuousplanar face, or a continuous planar plate, wherein the plane, the face,or the plate does not intersect the central rail, in particular, theguide system.

The central rail is advantageously configured as a hollow section. Thehollow section is preferably configured as a hollow section that iscircumferentially closed across an at least substantial length. Thehollow section is to be understood as a profile, wherein, for example, acavity of the profile is substantially enclosed at leastcircumferentially in relation to the longitudinal axis by way of wallportions of the profile such as an external side, for example, ahorizontal wall portion, or an, in particular, vertically running sidewall portion, for example, a central wall portion, and optionallyfurther wall portions. The synchronization elements are present, forexample, on mutually spaced apart and, for example, parallel runningside wall portions. The cavity is preferably a material-free hollowvolume which toward the outside, or in the radial direction toward acentral longitudinal axis of the guide rail, which is present, forexample, so as to run centrally in the hollow volume, is delimited bythe wall portions. The hollow section is preferably open at the endside, for example, at the end sides.

The central rail, or the hollow section, respectively, for forming anupper side and a lower side of the central rail by way of in each caseone separate central rail horizontal wall portion, comprises twopart-regions which in the cross section is in each case formed so as tobe triangular from a central rail horizontal wall portion and twocentral rail side wall portions adjoin the central rail horizontal wallportion in an angled manner. The cross section of the hollow section hasapproximately an outline contour of an egg timer, for example, or is inthe shape of a dumbbell having a central constricted region and twoend-side regions that are widened in the height direction, for example.

It is furthermore proposed that the cabinet unit rail and the slidingelement rail are configured so as to be C-profile-shaped, wherein thecabinet unit rail has a cabinet unit rail horizontal wall portion andtwo cabinet unit rail side wall portions, wherein the cabinet unit railside wall portions are present so as to be mutually spaced apart,wherein the sliding element rail has a sliding element rail horizontalwall portion and two sliding element rail side wall portions, whereinthe sliding element rail side wall portions are present so as to bemutually spaced apart, wherein the sliding element rail side wallportions and/or the cabinet unit rail side wall portions comprise/s aplanar raceway for synchronization elements of the sliding element guidesystem, wherein a plane of extent of the raceway of the sliding elementrail side wall portion and/or a plane of extent of the raceway of thecabinet unit rail side wall portion extend/s along a longitudinal extentof the rail elements, wherein the central rail is present so as to runbetween the cabinet unit rail side wall portions and/or the slidingelement rail slide wall portions, wherein the plane of extent of theraceway of a sliding element rail side wall portion in relation to theplane of extent of the raceway of a further sliding element rail sidewall portion encloses a sliding element rail angle, wherein the slidingelement rail angle is in an angular range between less than 180° and 0°,and/or wherein the plane of extent of the raceway of a cabinet unit railside wall portion in relation to the plane of extent of the raceway of afurther cabinet unit rail side wall portion encloses a cabinet unit railangle, wherein the cabinet unit rail angle is in an angular rangebetween less than 180° and 0°.

For example, the plane of extent of a raceway of a sliding element railside wall portion, and/or the plane of extent of a raceway of a cabinetunit rail side wall portion have/has a component of extent transverse toa longitudinal extent of the sliding element rail and/or transverse to alongitudinal extent of the cabinet unit rail and/or transverse to alongitudinal extent of the central rail. The cabinet unit rail and/orthe sliding element rail are/is advantageously configured so as to beC-profile-shaped.

The central rail is preferably configured as a hollow section that isenclosed by central rail wall portions, wherein the central rail wallportions comprise two central rail central wall portions, wherein thecentral rail central wall portions extend along and transversely to alongitudinal extent of the central rail, wherein the central railcentral wall portions are present so as to be mutually opposite andmutually spaced apart.

An internal angle between 30° and 70° is preferably configured betweenthe central rail horizontal wall portion, in particular, between a planeof extent of the central rail horizontal wall portion, and a centralrail side wall portion, in particular, a plane of extent of the centralrail side wall portion. For example, both central rail side wallportions are present on the central rail horizontal wall portion so asto be angled at the same internal angle. A central rail central wallportion advantageously adjoins a central rail side wall portion. Forexample, a central rail central wall portion is present so as to beangled in relation to the central rail side wall portion. For example, acentral rail central wall portion in the longitudinal extent of thecentral rail and in, for example, a vertical direction of extentadvantageously extends transversely, in particular, perpendicularly, inrelation to a plane of the central rail horizontal wall portion.

The carriage advantageously comprises a carriage cage, wherein thecarriage cage has, in particular, exactly one cage central element and,in particular, exactly two lateral cage side elements, wherein the cageside elements are in each case connected to the cage central element soas to be mutually opposite and mutually spaced apart, wherein a plane ofextent of a cage side element is present so as to be angled in relationto a plane of extent of the cage central element, wherein the plane ofextent of a cage side element and the plane of extent of the cagecentral element enclose an angle of less than 90°.

On account thereof, the carriage is capable of being disposed on theguide rails of the guide system in such a manner that the carriage isheld on the guide rails so as to be perpendicular to a direction ofmovement of the guide rails. The carriage, in particular, the carriagecage, is advantageously present in such a manner that the plane ofextent of a cage side element and the plane of extent of the cagecentral element in a state prior to an assembly of the carriage on theguide system enclose an angle of less than 90 degrees.

In one advantageous design embodiment of the carriage, a cage sideelement is connected to the cage central element in an articulatedmanner by way of a joint, for example, an integral hinge. The cage sideelements are advantageously in each case connected to the cage centralelement in an articulated manner by way of a joint. For example, eachcage side element is connected to the cage central element by means oftwo or more joints, in particular, integral hinges. The integral hingeadvantageously extends in the longitudinal direction of the carriage.The joint is preferably configured on the longitudinal side of the cagecentral element. Production of the carriage is facilitated on accountthereof. It likewise proves advantageous for the carriage to have twocarriage cages and a connection element, wherein the connection elementconnects the carriage cages to one another such that the carriage cagesare present so as to be mutually spaced apart. The carriage cages andthe connection element of the carriage are advantageously present asseparate components. The carriage cage and the connection element arepreferably producible in a mutually independent manner. It is alsoconceivable for the carriage to be configured so as to be integral. Itis moreover proposed that the connection element has a connectioncentral element and a connection side element, wherein a plane of extentof a connection side element is present so as to be angled in relationto a plane of extent of the connection central element, wherein theplane of extent of a connection side element and the plane of extent ofthe connection central element enclose an angle of less than 90 degrees.The guide system advantageously comprises two carriages that differ, inparticular, exclusively in terms of the lengths thereof. For example,the carriages of the guide system are configured so as to be identical.

In one advantageous embodiment of the sliding element guide system, thesynchronization element is present as a friction wheel, a gear wheel,and/or as a deflection roller. For example, the synchronization elementis present as a gearbox element or a gearbox means, for example, in theform of a gearbox. Synchronization of elements of the guide system isimplemented in a comparatively simple manner on account thereof.

It is moreover advantageous for the synchronization element to bedisposed on the central rail and to contact a surface, in particular, araceway, of a sliding element rail side wall portion and/or a surface,in particular, a raceway, of a cabinet unit rail side wall portion. Thefriction wheel is advantageously configured on the central rail centralwall portion. For example, an axis of the synchronization element isaligned so as to be parallel with a normal of the central rail centralwall portion. For example, the synchronization element is disposed so asto project on the central rail central wall portion. Synchronizationelement is preferably disposed on the end side of the central rail. Forexample, a rotation axis of the synchronization element is aligned so asto be parallel with a plane of extent of the central rail central wallportion. For example, the synchronization element is configuredpartially, in particular, completely, in the cavity of the central rail.For example, the synchronization element by way of more than 80%, inparticular, by way of more than 90%, extends into the cavity of thecentral rail. For example, the synchronization element is mounted so asto be movable, for example, rotatable, on the central rail central wallportion or on the central rail horizontal wall portion.

It likewise proves advantageous for the synchronization means to havetwo synchronization elements which are disposed so as to be mutuallyopposite and spaced apart on the central rail. Synchronization ofelements of the guide system is improved on account thereof, is, inparticular, configured so as to be redundant. A synchronization elementis advantageously configured for synchronizing a movement of the cabinetunit rail and a movement of the sliding element rail. On accountthereof, it is also conceivable that comparatively more elements of theguide system can be mutually synchronized than is the case with knownguide system synchronization mechanisms. For example, on accountthereof, the guide rails can be mutually synchronized, and/or thecarriages of the guide system can also be, in particular, simultaneouslymutually synchronized.

The central rail advantageously comprises two friction wheels ordeflection rollers. For example, the friction wheels are configured soas to be spaced apart and mutually opposite on the central rail onmutually opposite central rail central wall portions of the centralrail. The synchronization element is advantageously mounted so as to bemovable, in particular, rotatable, on two central rail horizontal wallportions that are present so as to be mutually opposite and mutuallyspaced apart. The synchronization element, in particular, the deflectionroller, is advantageously mounted so as to be movable on mutuallyopposite and mutually spaced apart central rail horizontal wall portionsin the region of an end, for example, an end side, of the central rail.

It is furthermore proposed that the synchronization element has a curvedshell face. The synchronization element is present, for example, as atoroidal or conical friction wheel, for example. The raceway of thesynchronization element, for example, of the friction wheel, isconfigured so as to be cambered, for example.

The cabinet unit rail and the sliding element rail preferably compriseraceways on which the friction wheel in the assembled state rolls in arelative movement of the rails of the guide system. The raceways arepreferably aligned so as to be angled in relation to the axis of thefriction wheel such that linear contact of the friction wheel with therespective rail is implemented.

It also proves advantageous for the synchronization element to bepretensioned in a direction transverse to a direction of movement of therails of the sliding element guide system. On account thereof,comparatively reliable, for example, friction-fitting, contact of thefriction wheel with raceways of the rails of the guide system isimplemented, for example. The synchronization element is present on thecentral rail in such a manner, for example, that the synchronizationelement is pretensioned in the disposed state of the central rail on theguide system.

It is moreover advantageous for the synchronization means to comprise arocker element, wherein the rocker element is disposed on a central railside wall portion, in particular, on the central rail central wallportion, wherein the synchronization element is assembled so as to bemovable on the rocker element such that an equalization of tolerance isimplemented. For example, the synchronization element is disposed so asto be rotatable on the rocker element. The rocker element isadvantageously present so as to be pivotable on the central rail. Forexample, a pivot axis of the rocker element is aligned so as to beparallel with a rotation axis of the synchronization element. Eachsynchronization element is preferably disposed on the central rail byway of a rocker element.

In one advantageous design embodiment, a gear means, for example, in theform of a rack, is configured on the surface, in particular, theraceway, of the sliding element rail side wall portion and/or on thesurface, in particular, the raceway, of the cabinet unit rail side wallportion, for example, on a carriage. On account thereof, a coupling, inparticular, in terms of gearing, of the sliding element rail and/or ofthe cabinet unit rail is implementable by way of the synchronizationelement. For example, the synchronization element is present as a gearwheel, and teeth of the gear wheel in the disposed state of the guidesystem engage in the rack such that the gear wheel is coupled to therack. It also proves advantageous for the carriage to have a rack or apinion, or a rack-type member, respectively.

It moreover proves advantageous for the surface, in particular, theraceway, of the sliding element rail side wall portion and/or thesurface, in particular, the raceway, of the cabinet unit rail side wallportion to be present so as to be structured. For example, the surfaceis present in the manner of sandpaper and/or so as to be roughened. Itis imaginable for the surface to have a mesh structure. The surface, inparticular, has a comparatively high coefficient of friction. On accountthereof, contact, in particular, frictional contact, between asynchronization element and the surface of the sliding element rail sidewall portion and/or the surface of the cabinet unit rail side wallportion is improved.

It is moreover advantageous for the sliding element guide system tocomprise two carriages, wherein the synchronization means are configuredfor synchronizing movements of the carriages.

It is furthermore proposed that the synchronization means have a cablepull, wherein the cable pull is present so as to enclose the centralrail in the manner of a loop, wherein the cable pull is mounted so as tobe movable on the synchronization elements. The synchronization meanspreferably comprise a cable pull system. The cable pull in the disposedstate is advantageously, in particular, fixedly connected to a couplingmember of the sliding element rail and/or a coupling member of thecabinet unit rail. The cable pull is advantageously mounted so as to bemovable on two synchronization elements, wherein the synchronizationelements are disposed on the end side on the hollow section.

It moreover proves advantageous for the synchronization means to havetwo cable pulls. For example, one cable pull couples to the slidingelement rail, and the further cable pull couples to the cabinet unitrail. The cable pulls are disposed so as to be mutually parallel, forexample, in particular, so as to be offset and spaced apart, on thecentral rail. The cable pulls are advantageously mounted so as to bemovable by way of the same synchronization elements. It is alsoconceivable for the cable pulls to be mounted so as to be movable by wayof different synchronization elements. On account thereof, differentelements of the sliding element guide system are capable of beingmutually synchronized by way of each cable pull. The cable pullsadvantageously transmit a movement between elements of the guide systemdirectly, in particular, without any positive and/or negative gearing.However, it is also conceivable for the synchronization means to bepresent in such a manner that one synchronization element and/or aplurality of synchronization elements transmits/transmit a movement ofone element of the guide system to another element by way of a positiveand/or negative gearing.

It is also proposed that the synchronization means are configured forsynchronizing a movement of the cabinet unit rail with a movement of thesliding element rail. It likewise proves advantageous for thesynchronization means to be configured for synchronizing a movement ofthe central rail with a movement of the cabinet unit rail and/or amovement of the sliding element rail.

It moreover proves advantageous for the synchronization means tocomprise an entrainment element which is configured for coupling to anejector and/or a receiver of a motion mechanism. The motion mechanism isconfigured, for example, as an automatic retraction mechanism or anejection, or ejector unit, respectively, for example, an automatictouch-latch mechanism. The motion mechanism is advantageouslydisposable, in particular, directly, on the sliding element guidesystem, for example, on the cabinet unit rail. The cable pull comprisesthe entrainment element, for example.

Furthermore proposed is an item of furniture or domestic appliancehaving a sliding element guide system according to one of themodifications discussed above.

BRIEF DESCRIPTION OF THE DRAWINGS

Further features and advantages of the present invention are explainedin more detail by means of the exemplary embodiments of the presentinvention illustrated in the figures.

FIG. 1 shows a schematically illustrated item of furniture according tothe present invention in a perspective view from obliquely above, havinga drawer received so as to be displaceable on the item of furniture;

FIG. 2 shows in the cross section a perspective fragment of an item offurniture in the region of a drawer side, neighboring a furniturecabinet unit wall and a furniture cabinet unit base;

FIG. 3 shows the fragment according to FIG. 2 in an end view;

FIG. 4 shows an exploded illustration of a functional unit of a guidesystem;

FIG. 5 shows an end portion of a central rail of the guide systemaccording to FIG. 4, illustrated in a perspective manner;

FIG. 6 shows a front view of parts of a guide system having asynchronization element;

FIG. 7 shows a perspective view from the rear and obliquely from aboveof the guide system as per FIG. 6;

FIG. 8 shows a perspective partial view from the rear and from obliquelyabove of parts of a guide system according to FIG. 6;

FIG. 9 shows a front view of a further guide system having a furthersynchronization element;

FIG. 10 shows a side view of the guide system as per FIG. 9;

FIG. 11 shows a side view of the guide system as per FIG. 9, wherein thecabinet unit rail and the sliding element rail are shown to betransparent;

FIG. 12 shows a front view of a further guide system having a furthersynchronization element;

FIG. 13 shows a perspective partial view from the front and fromobliquely above of the guide system according to FIG. 12;

FIG. 14 shows a front view of a further variant of embodiment of a guidesystem;

FIG. 15 shows a perspective partial view from the front and fromobliquely above of the guide system according to FIG. 14; and

FIG. 16 shows a perspective partial view from the front and fromobliquely above of part of a further variant of a guide system.

DETAILED DESCRIPTION OF THE INVENTION

The same reference signs are used to some extent hereunder forequivalent elements of different exemplary embodiments.

FIG. 1 very schematically shows an item of furniture 1 according to thepresent invention in a use state, having a hollow cuboid furniturecabinet unit 2 and a sliding element configured as a drawer 3, whereinthe drawer 3 is received so as to be displaceable on the furniturecabinet unit 2. The furniture cabinet unit 2 comprises two oppositevertical sidewalls 4 and 5, between which the drawer 3 by way of a guidesystem having telescopic guide means, for example, in an underfloorconfiguration, or a first rail full pullout 6 and a second rail fullpullout 7, respectively, is capable of being pulled out from thefurniture cabinet unit 2 in the horizontal direction according to P1 ofa state accommodated in the interior of the furniture cabinet unit 2,and is capable of being pushed thereinto in the opposite directionaccording to P2. The drawer 3 in FIG. 1 is shown in the state in whichthe drawer 3 is pulled to a maximum, or completely, respectively, out ofthe interior of the furniture cabinet unit 2. The storage volume of thedrawer 3 can thus be accessed in an almost unimpeded manner from above.

When in each case, a rail part-pullout is used instead of the rail fullpullouts 6, 7 on the drawer 3, the drawer 3, in the maximum pull-outstate, cannot be pulled out of the interior of the furniture cabinetunit 2 in the direction P1 as far as is possible by way of the rail fullpullouts 6, 7 according to the illustration in FIG. 1. The front element12 in this case is closer to the open front side of the furniturecabinet unit 2 than is shown in the case of the drawer 3 according toFIG. 1.

The rail full pullout 6 that is fastened to the inside on the side wall4 is located opposite the rail full pullout 7 which is obscured in FIG.1 and is indicated by dashed lines and which is fastened to the sidewall 5 at the same vertical height as the rail full pullout 6.

A further drawer which is not illustrated in FIG. 1 and which is guidedin a corresponding manner by way of rail full pullouts 8 and 9 iscapable of being accommodated in the furniture cabinet unit 2 above thedrawer 3.

The drawer 3 has opposite drawer side walls 10, 11 which in each casecomprises a constructed cavity frame, for example. The drawer 3 moreovercomprises a front element 12, a rear wall 13 that in the horizontaldirection lies opposite the latter, and a horizontally extending drawerbase 14 which reaches up to, or is connected to, respectively, thedrawer side walls 10, 11, the front element 12, and the rear wall 13.

FIGS. 2 and 3 in the region of a cabinet unit side wall 5 show afragment of a drawer 3 which in this case of an embodiment has cavityframes, having a drawer base 14 and a drawer side wall 11 that isconfigured as a cavity frame 15, and a rear wall 13. The drawer 3 isreceived by way of two functional units of a guide system on thefurniture cabinet unit 2, or by way of a rail full pullout 16 on theside wall 5, and in the same manner by way of a further cavity frame ofthe drawer 3 on the side wall 4 (not visible in FIG. 2). Receiving onthe side wall 4 is performed by way of a further functional unit, or afurther full pullout, by way of which the drawer 3 is displaceable in alinear horizontal manner in the directions P1 and P2.

The cavity frame 15 from a preferably bent sheet metal material has anexternal housing 15 a and an internal structure 15 b such that the fullpullout 16 is capable of being accommodated in a recess manner in theinternal volume of the cavity frame 15. The cavity frame 15 on aninternal side thereof in the lower portion of the cavity frame 15, thelatter is configured for receiving a longitudinal periphery of thedrawer base 14.

The full pullout 16 that is formed as a functional unit of the guidesystem comprises three mutually telescopic guide rails, or a cabinetunit rail 17, a central rail 18, and a sliding element rail 19,respectively.

The central rail 18 is configured as a hollow section.

A sliding element to be moved, such as the drawer 3, is coupled orconnected, respectively, to the sliding element rail 19, for example, isfixed to the cavity frame 15, whereas the cabinet unit rail 17 isconnected to the stationary part of the item of furniture. When the fullpullout 16 is used as an underfloor guide, a lower side of a slidingelement, or the base thereof, respectively, is supported on an upperside 19 a of the sliding element rail 19. A hook element 19 b which atthe rear end of the sliding element rail 19 projects upward forms adetent for a portion of a rearward external side of the sliding element,wherein for the exact positioning a portion of the hook element 19 bthat is angled so as to be parallel with the upper side 19 a engages ina depression prepared in a matching manner in the rearward external sideof the sliding element.

The full pullout 16 moreover comprises a first, or lower, respectively,carriage 20 having bearing members 37 disposed thereon, wherein thecarriage 20 between the cabinet unit rail 17 and the central rail 18acts for a load-transmitting relative movement of the rails 17, 18.

The full pullout 16 furthermore comprises a second, or upper,respectively, carriage 21 having bearing members 38 disposed thereon,wherein the carriage 21 between the central rail 18 and the slidingelement rail 19 acts for a load-transmitting relative movement of therails 18, 19.

The carriages 20 and 21, respectively, comprise two carriage cages 20 a,20 b, and 21 a, 21 b, respectively, and a connection element 39 and 40,respectively, for example.

Pins 32, by way of which a motion mechanism 22 of the full pullout 16,for example, for injecting and/or retracting the drawer 3, isattachable, are present on a vertically standing, inwardly pointingnarrower side of a rail member 31 of the cabinet unit rail 17.

Two L-shaped fastening elements 33 and 34 are part of the cabinet unitrail 17, wherein the fastening elements 33 and 34 serve for fastening orfixing, respectively, the full pullout to an internal side of the sidewall of a cabinet unit, such as the side wall 5 of the furniture cabinetunit 2 of the item of furniture 1.

The guide rails 17, 18, 19 are preferably composed of a sheet metalmaterial which, proceeding from the flat sheet metal material, isdeformed, for example, by a punching and bending method, so as to formthe final product of the respective guide rail.

FIG. 5 shows the front end portion of the central rail 18 relating tothe use state of the full pullout 16. The central rail 18 according tothe exemplary embodiment illustrated has an upper planar horizontal wallportion 23, a lower planar horizontal wall portion 24, two planar upperside wall portions 25, 26, two lower planar side wall portions 27, 28,and, in particular, vertically running central wall portions 29 and 30.

The horizontal wall portion 23 forms a distal wall, or an upper side ofthe central rail 18, respectively, or of the corresponding hollowsection, respectively. Accordingly, the horizontal wall portion 24 formsa distal wall, or a lower side of the central rail 18, respectively, orof the hollow section, respectively.

The terminology top and bottom refers to the orientation of the fullpullout 16 in the use state, or in the state attached to the item offurniture, respectively, shown, in particular, in FIGS. 2 and 3. Theplanes that are in each case defined by the mutually parallel horizontalwall portions 23 and 24, or the outboard or distal sides, respectively,herein are aligned so as to be at least almost horizontal.

Upper detents 35 and lower detents 36 are present on the central rail 18for delimiting a relative movement of the lower carriage 20 and of theupper carriage 21 in relation to the central rail 18 in the longitudinalextent of the central rail 18 according to a central longitudinal axis L(cf. FIG. 5).

In the case of the fully assembled full pullout 16, the bearing membersthat are received on the carriages 20, 21 run on the outwardly directedsides of the central rail 18, or the horizontal wall portions 23, 24 andthe side wall portions 25-28, respectively. The lower carriage 20 by wayof the portions 20 a and 20 b thereof that support the bearing membersexternally encompasses the horizontal wall portion 24 and the side wallportions 27, 28. The upper carriage 21 by way of the portions 21 a and21 b thereof that support the bearing members externally encompasses thehorizontal wall portion 23 and the side wall portions 25, 26.

An internal angle α between the plane according to an internal side 41of the horizontal wall portion 23 of the central rail 18, and the planeaccording to an internal side 42 of the side wall portion 26, ispreferably between 20 and 70 degrees, preferably between 35 and 55degrees, preferably approximately 45 degrees.

FIGS. 6 to 8 show a first variant of a guide system 43 according to thepresent invention. The guide system 43, apart from the elements alreadydescribed above, i.e. the cabinet unit rail 17, the central rail 18, thesliding element rail 19, and the carriages 20, 21, comprisessynchronization elements in the form of wheels 46, 47 whichsynchronization elements are present so as to be mutually opposite andmutually spaced apart on external sides 44, 45 of the central wallportions 29, 30 of the central rail 18 (the carriage 21 in FIG. 6 istransparent). The wheels 46, 47 are disposed so as to project on thecentral wall portions 29, 30 of the central rail 18 in such a mannerthat the wheels 46, 47 in the disposed state of the central rail 18 onthe guide system 43 roll on raceways 48, 49 of the cabinet unit rail 17and on raceways 50, 51 of the sliding element rail 19. On accountthereof, the wheels 46, 47 synchronize a movement of the sliding elementrail 19 in relation to the cabinet unit rail 17.

Planes of extent of the raceways 48, 49 of the cabinet unit rail 17advantageously enclose a cabinet unit rail angle β which forms an angleof the size between less than 180° and 0°. For example, the planes ofextent of the raceways 50, 51 of the sliding element rail 19 enclose asliding element rail angle δ which forms an angle of the size betweenless than 180° and 0°.

The wheels 46, 47 have a curved shell face 52, 53, for example, inparticular, a cambered shell face. The shell face 52, 53 of the wheels46, 47 is advantageously configured in such a manner that the wheels 46,47 in the disposed state of the guide system 43 are connected to theraceways 48-51 in a friction-force-fitting manner. The wheels 46, 47 onthe shell face 52, 53 are rubberized, for example. Furthermore, thewheels 46, 47 are advantageously fastened to the central wall portions29, 30 so as to be movable by means of rocker elements 54, 55.

FIGS. 9 to 11 show a further variant of a guide system 56. The guidesystem 56, apart from the elements already described above, i.e. thecabinet unit rail 17, the central rail 18, the sliding element rail 19,and the carriages 20, 21, comprises a synchronization element in theform of a gear wheel 57 on the external side 45 of the central wallportion 30 of the central rail 18. The gear wheel 57 is fastened so asto be movable, in particular, rotatable, on the external side 45 of thecentral wall portion 30. It is moreover conceivable but not shown inFIGS. 9 to 11 for a further gear wheel to be present on that externalside 46 of the central wall portion 29 of the central rail 18 whichexternal side 46 is opposite the external side 45. The carriages 20, 21of the guide system 56 furthermore advantageously comprise rack-likecontours 70, 71 in which disposed state of the guide system 56 the gearwheel 57 engages, and on account thereof mutually synchronizes amovement of the carriages 20, 21. It would moreover be imaginable forthe cabinet unit rail 17 and the sliding element rail 19 to havecorresponding rack-like contours in which the gear wheel could engage,such that a movement of the cabinet unit rail 17 relative to the slidingelement rail 19 is synchronized (not illustrated).

A further variant of embodiment of a guide system 58 is shown in FIGS.12 and 13. The guide system 58, apart from the elements alreadydescribed above, i.e. the cabinet unit rail 17, the central rail 18, thesliding element rail 19, and the carriages 20, 21, comprisessynchronization means in the form of deflection rollers 60 on mutuallyopposite end sides 59. Movements of the deflection rollers 60 aremutually synchronized by means of an encircling cable pull 61. Thedeflection rollers 60 under cable pull 61 advantageously form a cablepull system 64. A rotation axis of the deflection rollers 60 isadvantageously configured so as to be transverse, in particular,perpendicular, to a direction of movement of the rail elements 17-19 ofthe guide system 58. For example, the deflection rollers 60 are mountedso as to be movable, in particular, rotatable, on the central rail 18.Two entrainment elements 62, 63 are advantageously configured on thecable pull 61. For example, the entrainment element 63 is fixedly, inparticular, non-releasably, connected to the cabinet unit rail 17, andthe entrainment element 62 is fixedly, in particular, non-releasably,connected to the sliding element rail 19, on account of which a movementof the cabinet unit rail 17 relative to the sliding element rail 19 issynchronized by way of the cable pull system 64.

A further embodiment of a guide system 65 can be derived from FIGS. 14and 15. The guide system 65 differs from the preceding described guidesystem 58 from FIGS. 12 and 13 in that the cable pull system 64 hascoupling elements 66, 67 instead of, or e.g. additionally to, theentrainment elements 62, 63. The cable pull system 64 is, in particular,non-releasably, connected to the carriages 20, 21 by way of the couplingelements 66, 67. On account thereof, the cable pull system 64 of theguide system 65 mutually is synchronizes a movement of the carriages 20,21.

A further alternative embodiment of a guide system 68 is shown in FIG.16. For improved clarity, only the central rail 18, the carriages 20,21, as well as the cable pull system 64 are in FIG. 16. The cable pullsystem 64 of the relative embodiment of the guide system 68 of FIG. 16comprises a coupling member 69 instead of, or additionally to, theentrainment element 62, and/or the coupling elements 66, 67. Thecoupling member 69 is fastened to the cable pull 61 of the cable pullsystem 64. The coupling member 69 is advantageously present on the guidesystem 68 in such a manner that a synchronization element, for example,in the form of a synchronization bar (not shown), is disposable on thecoupling member 69, such that a movement of parts of the guide system 68is capable of being synchronized with parts of a second guide systemwhich in the disposed state on the item of furniture is present so as tobe opposite the guide system 68 on the item of furniture.

LIST OF REFERENCE SIGNS

1 Item of furniture

2 Furniture cabinet unit

3 Drawer

4-5 Side wall

6-9 Rail full pullout

10-11 Drawer side wall

12 Front element

13 Rear wall

14 Drawer base

15 Cavity frame

15 a Housing

15 b Internal structure

16 Full pullout

17 Cabinet unit rail

18 Central rail

19 Sliding element rail

19 a Upper side

19 b Hook element

20 Carriage

20 a-20 b Carriage cage

21 Carriage

21 a-21 b Carriage cage

22 Motion mechanism

23-24 Horizontal wall portion

25-28 Side wall portion

29-30 Central wall portion

31 Rail member

32 Pin

33-34 Fastening element

35-36 Detent

37-38 Bearing member

39-40 Connection element

41-42 Internal side

43 Guide system

44, 45 External side

46, 47 Wheel

48-51 Raceway

52, 53 Shell face

54, 55 Rocker element

56 Guide system

57 Gear wheel

58 Guide system

59 End side

60 Deflection roller

61 Cable pull

62, 63 Entrainment element

64 Cable pull system

65 Guide system

66, 67 Coupling element

68 Guide system

69 Coupling member

70, 71 Contour

1. A sliding element linear guide system for a furniture item or adomestic appliance, the sliding element linear guide system comprising:a cabinet unit rail; a central rail; a sliding element rail; at leastone carriage including bearing elements; and two identicalsynchronization wheels, each rotatably mounted on a vertically orientedcentral rail side wall via a respective pin extending horizontally fromthe vertically oriented central rail side wall, wherein the carriagecomprises a first carriage associated with the cabinet unit rail and thecentral rail, and a second carriage associated with the sliding elementrail, and wherein the cabinet unit rail, the central rail and thesliding element rail are movably mounted such that the cabinet unitrail, the central rail and the sliding element rail are moveable inrelation to one another, wherein the two identical synchronizationwheels synchronize a movement of the cabinet unit rail with a movementof the sliding element rail, wherein the two identical synchronizationwheels are spaced apart on mutually opposite end sides of the centralrail or on mutually opposite external sides of the central rail, whereinan internal angle α between a plane of extent of a central railhorizontal wall portion and a plane of extent of a central rail sidewall portion is in a range of 30° to 70°, wherein a plane of extent of araceway of a first sliding element rail side wall portion in relation toa plane of extent of a raceway of a second sliding element rail sidewall portion encloses a sliding element rail angle δ, wherein thesliding element rail angle δ is in an angular range between 0° and 180°,and/or wherein a plane of extent of a raceway of a first cabinet unitrail side wall portion in relation to a plane of extent of a raceway ofa second cabinet unit rail side wall portion encloses a cabinet unitrail angle β, wherein the cabinet unit rail angle β is in an angularrange between 0° and 180°.
 2. The sliding element linear guide systemaccording to claim 1, wherein the two identical synchronization wheelsare gear wheels or friction wheels.
 3. The sliding element linear guidesystem according to claim 1, wherein the two identical synchronizationwheels mounted on the central rail contact a raceway surface of asliding element rail side wall portion and/or a raceway surface of acabinet unit rail side wall portion.
 4. The sliding element linear guidesystem according to claim 1, wherein the two identical synchronizationwheels have a curved shell face.
 5. The sliding element linear guidesystem according to claim 1, wherein the two identical synchronizationwheels are pretensioned in a direction transverse to a direction ofmovement of the rails of the sliding element guide system.
 6. Thesliding element linear guide system according to claim 1, wherein thetwo identical synchronization wheels are assembled to be movable on arocker element disposed on a central rail side wall portion, whereby anequalization of tolerance is implemented.
 7. The sliding element linearguide system according to claim 1, wherein the sliding element rail sidewall portion includes a raceway surface and/or the cabinet unit railside wall portion includes a raceway surface.
 8. The sliding elementlinear guide system according to claim 7, wherein gear means comprisinga rack is configured on the raceway surface of the sliding element railside wall portion and/or on the raceway surface of the cabinet unit railside wall portion.
 9. The sliding element linear guide system accordingto claim 1, wherein the at least one carriage comprises two carriages,and wherein the two identical synchronization wheels synchronizemovement of the two carriages.
 10. The sliding element linear guidesystem according to claim 1, wherein the two identical synchronizationwheels synchronize a movement of the central rail with a movement of thecabinet unit rail and/or a movement of the sliding element rail.
 11. Anitem of furniture or domestic appliance having a sliding element linearguide system according to claim 1.